I would guess that you would be trying to synchronise your appointments?
It is entirely dependent on the software provided with your phone. If it has the capability, look for an option to synchronise your appointments.
Outlook does not save a 'calendar' as a specific item. It stores emails, contacts, appointments etc within a database file called Outlook.pst
You would have to be very skilful to extract your appointments from that file, and transfer them to your phone as useful appointments.